Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf321ca05e755d90d24e124015ccc5ec3231dfd0c5ea82b3d86903cd97442018' 
  AND token = 'sTHMwFAyatFCIM1K0s0PxWCGq3EgystiHsKrZ1eM1BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}